Re: Avoiding string duplication
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- Subject: Re: Avoiding string duplication
- From: Sean Conner <sean@...>
- Date: Fri, 8 Nov 2019 05:55:05 -0500
It was thus said that the Great Chris Smith once stated:
>
> On 6 Nov 2019, at 19:05, Roberto Ierusalimschy <roberto@inf.puc-rio.br> wrote:
> >
> > For all these reasons, it seems very unlikely that Lua will ever
> > change to a copying collector. Maybe it is time to change the manual
> > and make official this behavior?
>
> I would certainly like to see this made official. However, it does raise
> some other interesting points and questions:
>
> - Strings are immutable in Lua, but not in C. C code can directly modify
> a Lua string
Only by casting away the const modifier. Also, you can't change the size
of the string (or bad things might happen). But sure, yeah, C can do that.
> - Is there any real difference between Userdata and String objects? Are
> Strings simply Userdata whose content is cached and on which string
> functions can be called?
>
> - Do we need both types? Would it be useful to be able to convert between
> Userdata and String objects? That is, to explicitly uncache/duplicate a
> String object or to mark Userdata as containing String data?
There was a long thread about this back in 2014:
http://lua-users.org/lists/lua-l/2014-08/msg00657.html
-spc
- References:
- Avoiding string duplication, Chris Smith
- Re: Avoiding string duplication, Sean Conner
- Re: Avoiding string duplication, Chris Smith
- Re: Avoiding string duplication, Viacheslav Usov
- Re: Avoiding string duplication, Chris Smith
- Re: Avoiding string duplication, Viacheslav Usov
- Re: Avoiding string duplication, Sean Conner
- Re: Avoiding string duplication, Viacheslav Usov
- Re: Avoiding string duplication, Roberto Ierusalimschy
- Re: Avoiding string duplication, Chris Smith